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Potentiometric titration of microhydrolysis products of oils: A new low-cost methodology and investment for the analysis of oil binders present in works of art.
Talanta ( IF 5.6 ) Pub Date : 2020-01-13 , DOI: 10.1016/j.talanta.2020.120736 Thiago G Costa 1 , Lino Meurer 1 , Gustavo Amadeu Micke 2 , Samantha Gonçalves 2 , Bruno Szpoganicz 2 , Antônio S Mangrich 2
Talanta ( IF 5.6 ) Pub Date : 2020-01-13 , DOI: 10.1016/j.talanta.2020.120736 Thiago G Costa 1 , Lino Meurer 1 , Gustavo Amadeu Micke 2 , Samantha Gonçalves 2 , Bruno Szpoganicz 2 , Antônio S Mangrich 2
Affiliation
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The analysis of oil paints present in historical paintings is commonly carried out for research, authenticity and forensic purposes. This paper proposes potentiometric titration and calculation of the fatty acids concentrations with the aid of the Best7 program as an alternative technique to characterize the oil binders used in works of art. The method involves determining the ratio between the levels of palmitic (P) and stearic (S) acids present in the microhydrolysis products of commercial oil binders and paints. The microhydrolysis products were characterized, using FTIR spectroscopy, by displacement of the carbonyl band and the pKa values for the C16 and C18 in the system studied were determined. The P/S ratios found for the microhydrolysis products of linseed, palm and nut oils were 1.65, 5.91 and 2.42, respectively. For the commercial paints analyzed, values ranging from 1.34 to 1.98 were obtained, characterizing the presence of linseed oil. The values were confirmed by GC-MS and are in agreement with those reported in the literature for the oils investigated in this study.
中文翻译：
油微水解产物的电位滴定：一种新的低成本方法和技术，用于分析艺术品中存在的油性粘合剂。
通常对历史绘画中存在的油漆进行分析是出于研究，真实性和法证目的。本文提出了利用Best7程序的电位滴定法和脂肪酸浓度的计算方法，作为表征艺术品中所用油性粘合剂的替代技术。该方法涉及确定在商业油性粘合剂和油漆的微水解产物中存在的棕榈酸（P）和硬脂酸（S）之间的比例。使用FTIR光谱对微水解产物进行表征，方法是通过羰基带的位移确定所研究系统中C16和C18的pKa值。亚麻籽油，棕榈油和坚果油微水解产物的P / S比分别为1.65、5.91和2.42。对于分析的商业涂料，获得的值在1.34至1.98范围内，表征了亚麻籽油的存在。该值通过GC-MS确认，与本研究中所研究油的文献报道一致。
更新日期：2020-01-13
中文翻译：
油微水解产物的电位滴定：一种新的低成本方法和技术，用于分析艺术品中存在的油性粘合剂。
通常对历史绘画中存在的油漆进行分析是出于研究，真实性和法证目的。本文提出了利用Best7程序的电位滴定法和脂肪酸浓度的计算方法，作为表征艺术品中所用油性粘合剂的替代技术。该方法涉及确定在商业油性粘合剂和油漆的微水解产物中存在的棕榈酸（P）和硬脂酸（S）之间的比例。使用FTIR光谱对微水解产物进行表征，方法是通过羰基带的位移确定所研究系统中C16和C18的pKa值。亚麻籽油，棕榈油和坚果油微水解产物的P / S比分别为1.65、5.91和2.42。对于分析的商业涂料，获得的值在1.34至1.98范围内，表征了亚麻籽油的存在。该值通过GC-MS确认，与本研究中所研究油的文献报道一致。
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